random mutagenesis led to the identification of three variants with (E,E)‐homofarnesol conversion properties improved about 1.5‐ to 10‐fold over that of the wild type enzyme. Eight distinct amino acid mutations were identified overall; only one mutation was at the active site of the enzyme. Each of the three variants contained only two or three mutations over the 631 amino acids of the Alicyclobacillus acidocaldarius
酸热脂环酸鲨烯角鲨烯环化酶已发展成为适合工业规模生产(-)-Ambrox的生物催化剂。一轮随机诱变导致鉴定了三个变体,其(E,E)-同型芳樟醇转化性能比野生型酶提高了约1.5到10倍。总的来说,鉴定出八个不同的氨基酸突变。该酶的活性位点只有一个突变。这三个变体中的每一个仅在酸热脂环酸杆菌角鲨烯Hopene环化酶多肽链的631个氨基酸上仅包含两个或三个突变。导致改善的变异(E,E)-均胺酚转化率得到了确认。对反应条件的研究导致选择了一种变体,通过该变体,针对工艺相关条件优化了反应参数。提出了一种全细胞生物转化过程,其中产生改良的角鲨烯Hopene环化酶变体的大肠杆菌细胞可在≤72小时内转化125 g / L(E,E)-异壬烯醇。通过为工业规模的生物催化角鲨烯Hopene环化酶环化反应建立通用基础,开发出的香精成分(-)-Ambrox作为Ambrofix®的开发方法扩展了生物催化工具箱。
PRODUCT COMPRISING A PLASTIC CONTAINER AND A SUBSTANCE COMPOSITION
申请人:Symrise AG
公开号:EP3507352A1
公开(公告)日:2019-07-10
[EN] PRODUCT COMPRISING A PLASTIC CONTAINER AND A SUBSTANCE COMPOSITION<br/>[FR] PRODUIT COMPRENANT UN RÉCIPIENT EN PLASTIQUE ET UNE COMPOSITION DE SUBSTANCE
申请人:SYMRISE AG
公开号:WO2018041354A1
公开(公告)日:2018-03-08
The present invention primarily relates to a product comprising or consisting of a plastic container (i) comprising or consisting of PE and/or PP and/or PET, and a specific composition (ii) contained in the container, wherein detrimental interactions between the container (i) and the composition (ii) contained therein are minimised.
Supercritical process for manufacturing ambradiol, sclareolide and (-)-ambrafuran from sclareol
申请人:Koste Biochemicals
公开号:EP2546244A1
公开(公告)日:2013-01-16
The present invention relates to a process for manufacturing products of interest selected from the group comprising ambradiol, sclareolide and (-)-ambrafuran, from a starting material which is sclareol, said process comprising a step of biological conversion of sclareol and at least one further step performed within a pressured vessel, which preferably is a purification step using CO2 supercritical extraction, or a further chemical conversion step which is selected from the group comprising supercritical hydrogenation, supercritical dehydration, hydrogenation in subcritical water or dehydration in subcritical water.